Best method for this need

I can think of a way to do this, but I'm wondering what the best method would be to do the following.

I need to inject a shape from my module into the homepage only. I'm going to do this in the Layout.cshtml of my theme. My module doesn't use ContentItems or anything, so I'd like to avoid creating a widget or anything.

What would be the best way to ONLY inject the following for the homepage in my Layout.cshtml?